Sound-box for talking-machines.



E. H. MOBLEY.

souNo Box Fora TALKING MAcHiNss.

APPLICAUON FILED MAY Il, |914.-

1,1%;499,v Patented July 6,1915.

Mmm-om,

aww/meme EDWIN H, MGBLEY, ROSLYN, PENNSYLVANX.

SOUNB-BDX FOR TLKING-MACHENE To all 'whom 'it mag/concern:

Be it known that I, EnWiN H. Monnier, a citizen of the United States,and a resident of Roslyn, county oii/ontgomery, State of 5 Pennsylvania,have invented certain new and useful I Improvements in Soundloxes forTalking-Machines, of which the foilow ing is a description.

.The Objectis to provide an improved and 10- simplified stylus barmounting for sound boxes for talking machines, and particularly withrelation to the manner of mounting the stylus bar comprising a part ofthe sound box covered by my,y Patent No. 855,826,

1.5 issued May 28, 190?.

1 vAnother object is to provide an improved and simplii'iedmounting forthe stylus bar covered by my Patent No. 899,256, issued September 9.2,1908. l

yStill another object is to provide an irnproved diaphragm forsoundboxes over that covered by my Patent No. 834,629, issued, Getober 30,1900, and Patent No. 648,975, issued, May 8, 1900. r

A further object is to provide a support for a stylus bar in thesubstantially regularly curved sound box casing proper, Withoutnecessitating the addition thereto of an l integral or othei\\ 'iseattached projection. `Another object is to provide asubstantiallyinvisible support for the stylus bar, located Within thecasing. Additional obljects and advantages of the invention arehereinafter fully brought out inthe following' specification when readin conjunction .with the Aacconipanying drawings, in Which-'- Figure lis a front elevation of a sound box-comprising Lthe preferred embodimentVofthe invention; Fig. 2 is an enlarged detail vview of the diaphragmemployed; Fig. 3` is a diametri-cal .section of the saine; Fig. lisavfragmentary section of a inodiiied forni. of diaphragm; Fig. 5 is asimilar View 45 oflstill another inodilication; F ig. 6 is a diametricalsection on 'the line 6 6 of Fig. .1;. Fig.- 7 isa fragmentary eleva-tionof a modified vforni of sound box casing; Fig. 8 is a fragmentaryperspective view of the im roved manner of mountimT the 'stflus bar;Fig. 9 is an enlarged fragmentary view of the stylus bar mountingemployed in the inodii'icatlon shown in Fig. 7, the

saine being. partlv insection; Fig.-,10 isA 5v5 an enlarged detailsectional View of the manner of mounting the stylus bar ofiny Specicatonof Letters Eatent.

remates Jane, i915.

Application filed day 11, 1914. Serial No. 637,638.

Patent No. 899,256 inl accordance with the.

present invention; and Fig. l1 shows a form of stylus bar adapting asound box to either laterally or `vertically directed record un* :ing tothe drawings, the invention in its preferred forni comprises acylindrical easing l0, 1, mined inwardly at its forward edge portion toform a flange-11 and partially closed at the rear by a back-plate 12,provided on its peripheral edge with a substantie ly cyiindrical flange13,'adapted to frictionaiiy coperate Withjthe inner surface of saidcasing and secured in place in any suitable manner, as by the screwslli. The plate l2 is provided with va central opening i5 and has firmlysecured thereto and in axial alinenient with said opening, a

tone arm or sound conveyer coupling 16, provided with a radiallyextending ange l?, secured to said plate by suitable means i8, butinsulated thereiromlby a Washer 19, the inner surface of the couplingbeingprovided with a cylindrical Washer 21, secured in place by screws22, or by any other desired means. ?ositioned within said casing betweenand bearing againstthe iange iland peripheral edge portion of the innerface of the bacloplate l2, are two annular washers 25, preferably madeof rubber` and in cross section either solid, or circular and hollow,between which is supported the irnproved form of diaphragm 28. 0n theontside of the casing and either integral. there with, or unitarilysecured thereto as by solthumb-screw 37', operative to secure in saidhead any desired forniof stylus 3S. Adja-- cent to the upper terminus ofthe head 85, said stylus bar is preferably drilled'and provided with apin el sur ounded by Washers 42, operative to space the bar from theadjacent portions of the casing 'when innorinal position. The -front ofsaid casing'is recessed at 45, to permit the passage of the stylus bartherethrough, and the adjacent portions of the inner surface of thefiange l1 are gouged or notched tottorxn substantially V-shaped recesses46 for the reception of the ends 47 of the pin 41, said ends beingpreferably curved, tapered and angu lirly shaped or iounded in crosssection, to present an antifrictional engagement between theserelatively movable elements,

The inner end of the stylus bar is transversely curved at 50 andenlarged to form a head 51 adapted to bear against the diaphragmdirectly, or against an interposed protecting or stitfening plate 52,secured to said diaphragm in any suitable manner. The head of the stylusbar may be recessed on its under side to receive the extreme end portionof the spring 34, and, when mount ed in operative position, the tensionof the bai" on the diaphragm is readily and finely adjusted or regulatedby the screw 32, the combined outward pressures of the spring anddiaphragm operating to firmly seat the ends of the pin 41 in position inthe recesses 46.

In the modified lform of the device shown in Figs. 7 and 9, the inwardlydirected flange 11 is of. somewhat greater extent and is recessed at 55substantially as shown in said figures, in which case, as itisimpossible to place the stylus bar in position by tilting the saineinwardlybefore the diaphragm is positioned and then moving the ends ofthe pin 41 around the flange and backwardly into the recesses providedtherefor, there are provided offsets 56 to said recess in the outercylindrical surface of the casing, as shown in Fig. 9 and through theseoffsets the stylus bar supporting pin is readily inserted. Thisembodiment of the device possibly presents a better appearance than theformer, but also acts to reinforce the flange 11, as well as to concealsubstantially entirely the pin support. 'In other ways there isno'substantial differencebetween the preferred and modified forms asherein described.

The form of diaphragm illustrated in Figs. 2 and 3 comprises inl generala substantially flat'central portion 61, provided with a centralaperture 62, through which is secured a riveted projection G3 of thestilfening plate Surrounding this portion 61 is a radially corrugatedannular portion 64,

having the function of the similarly raised portion of the diaphragmillustrated in Patent No. 648,975, the corrugations of said portionbeing bounded by an annular corrugation 65, immediately adjacent theretobut distinct therefrom. Finally, the extreme edge portion of thediaphragm constitutes a semi-corrugation 66, extending in the samedirect-ion as the adjacent corrugation G5, this construction creating,under otherwise eX- actly similar` circumstances, an increased purity ofthe tone, produced, while the characteristics of the tone are radicallyaltered.

The modification of the diaphragm shown in Fig. 4 presents a. relativelynarrow round-i ed corrugation 67 next to the portion 64, while a secondannular corrugation 68, similar to the last, is spaced therefrom by arelatively flat annular portion 69, the edge por-` tion of the diaphragmbeyond the latter cor\` rugation comprising' a reversely curved section70.

Fig. 5 shows the raised portion 64 of the portion 78 of the stylus barare pointed 'and adapted to enter and coperate with the innermostportions of the recesses 79 provided therefor inthe inner face of theflange 11 of the casing 10 and adjacent to the aperture 45. The stylusbar is held in place by the usual spring and diaphragm as hereinbeforedescribed. 5

A form of stylus bar which is particularly adaptable to the improvedsound box above described, is shown in Fig. 11 and comprises a shank 85,inwardly bent dia phragm-engaging portion 86 and integral stylusreceivinv head portion 87. The bar is provided with I the preferred.form of transversely extending supporting pin 41, while the head 87 hassecured thereto yet spaced therefrom an auxiliary head 88 upon `theouter side thereof and adapted to receive and support a suitable steelor permanent stylus 89. With a stylus in the head 87, a sound boxequipped with this form of stylus bar is capable of reproducing arecor.sound carried by a laterally undulatory groove, while a stylus in thehead 88 makes the sound box capable of reproducing a record lof soundcarried by a vertically undulatory, or hill-and-valley, groove.

Although sound boxes constructed iiiaccordance with this inventionreproduce records in either form of groove equally well, the exactoperation of the stylusbar upon its pivotal support is not entirely andaccurately understood. i

Having thus described my invention, what I claim and desire to protectby Let-I ters' Patent of the United States, is z- 1. A sound box,comprising a casing, a stylus bar, and a diaphragm and a springcooperating with .said bar in opposed relation, said bar being pivotallymounted directly upon the inner surface of said casing facing andadjacent to said diaphragm.

2. A sound box, comprising ahollow cas- Y pivotal engagement With theinner surface of said flange.'

3. A sound box comprising a hollow casing having a radially, inwardlydirected extension, a stylus bar, an extension from said bar operativeto engage the inner surface of said first extension, and a diaphragm anda spring coperating with said bar in opposed relative, and togethermaintaining said bar extension in pivotal y engagement with the innersurface of said first-named extension.

4. A- sound box comprising a casing having a radially, inwardlyprojecting iiange provided with an opening, the inner surface of saidflange being recessed adjae' cent to said opening, a stylus bar,oppositely disposed, taperedextensions from said bar extending withinsaid casing and pivotally engaging the inner surface ot said flange insaid recesses, and a diaphragm and a spring coperating with said bar inopposed relation, to maintain said bar extensions in operative position.

5. A sound box comprising a casing having a radially, inwardlyprojecting flange provided with an aperture at one side, and a stylusbar extending through said aperture and Aprovided with laterallyextending tapered shoulders in turn provided on one side with knifeedges, said edges pivotally engaging within recesses in said flange onthe inner side of the latter and adjacent to said aperture.

6. A sound box,fcomprising a hollow casing; 'having a radially inwardlydirected flange, a "stylus bar, oppositely disposed exrtensions fromsaid bar extending within said casing, anda diaphragm and a resilientmeans coperating with said bar in opposed relation, and togethermaintaining said, extensions in pivotal engagement with the "inner:'surface `o said ,ange

- hereof, -I'.;h ave. hereunto set th day 'of A ril, A. D., 1914:.

N- MOBLEY.

